Desk operator&#39;s circuits



W. A. RHODES. DESK OPERATORS cmcuns. APPLICATION FILED DEC-5. 1918.

Patented Mar. 22', 1921.

INV EN TOR. Rfiades BY g 5 2 ATTORNEY UNITED STATES WILLIAM PALIENT OFFICE,

A. RHODES, or new YORK, N. Y., Assrelvoaro AMERIcnn rEnErnoNE AND TELEGRAPH COMPANY, A conroae'rroivor NEW YORK.

DESK OPERATORS CIRCUITS.

Specification of Letters Patent. Patented :M 1921 Application filed December 5, 1918. serial is. 265,437. it y To all whom it may concern: y i Be it known that I ,,VVILLrA1vrA.. RHODES residing at New York, in the county of New York and State of New York, have invented certain Improvements in Desk Operators Circuits, of which the cation.

terns wherein interconnection between diti'erent stations, such as information} desks, wire chiei's desks, repair clerks. desks or the like is desired. In such interconnections it is customary to provide the stations with keys which upon manipulation serve to signal a station to which connection is desired by any suitable means, such as lamps, and

the operator at the signaled station in rcsponding will also operate a similar key to connect her telephone; apparatus to the trunk. In such systems some confusion has arisen by the operators at either of the stations neglecting to immediately restore their apparatus to normal at the termination of the connection thus causing false signals. One of the objects of this invention is to prevent signals of this character. t 7

Another object consists in the provision of a two way automatic signaling arrangement whereby the same circuits and equipment are employed at both ends and either end is adapted to be associated with any of the above mentioned stations without change in the circuit arrangements. Other and further objects of the lnvention will hereinafter appear. y a

In the accompanying drawing is diagrammatically illustrated one embodiment of this invention.

At A and B are shown stations provided with listening keys or circuit controllers K and K respectively, and other apparatus appertaining to an operators station. a The stations A and B are interconnected by the usual trunk conductors 1 and 2.

It will be assumed that an operator at station A desires connection with station B. In such case the key K is operated and connects the telephone set at station A withthe talking circuit by means of the contacts 3 and 4 in the usual manner. The operation of the key K also energizes the relay 5 by a path from ground, contact 6 oikey K, rcsistance'T, winding of relay 5 to grounded battery. The armature of relay 5 is then attracted and an energizing circuit for refollowing is a specifio is locked. The energization of relay.8 This invention concerns telephone syslay Scat station B is thereupon completed flfroingrounded battery, winding of relay5 11d its armature, signaling conductor 9,

ductor 12, winding of relay ,8 to ground. Upon the complet on of this circuit the relay causes the lamp 13 to be illuminated and notice is thereupongiven the o orator at station B, who actuates the key k and connccts her telephone set to the talking conductors l and 2, by means of the key contacts Hand 15, in a manner similar to that described in connection with the actuation of the key K at station A. The key K upon actuation also energizes relay 11 in amanner is provided for relay 11 from grounded bat t ery, through the winding of said relay and lts front contact and armature signaling conductor 9, front contact and armatureof re lay 5, resistance 7, contact 6.01 keyK to ground. Should the operator at station B desire to communicate with station A, the same on der of operations would occur as that. de; scrlbed no connection with station A. Upon the depression of the keyK the telephone set would be connected to the talking conductors 1 and Qthrough the contacts. 14 and 15. The relay 11 would also be energized by a path for current from ground, contact l6, resistance 17, through the winding of said relay to grounded battery. The armature of relay 11 would thus be attracted and cause the relay 19at station A to be energized by the following circuit: grounded battery winding and armature oi relay 11 over the signaling conductor 9, armature oi relay 5, winding of relay 19 to ground. The armature of relay 19 would then be attracted causlng the lighting of lamp 520 and attract ingthe attention of the operator at station A in the usual Way, who would thenma nipulate the key K. Uponthe operation of 110 armature and contact 10 of relay 11, 0011- I the key K the relay 5 is energized by a circuit from. contact 6 of said key, resistance 7, winding of relay 5, to grounded battery.

The armature. of said relay is thus caused to break the circuit atcontactlS and retire the lamp 20. The relays 5 and 11 are now looked over circuits previously traced and remain so until the telephone apparatus is disconnected from both ends of the trunks andthe circuit is returned to normal.

'Fromtheabove described circuit arrangement, it will be seen that the relays'5 and 11 are each under the'joint control of keys K and K at the-two ends of the trunk so that both keys must be restored before these relays will be released. -Were it not for the locking circuits above described it the operator at station 13 should restore the key K before the operatorat station A restored the key K,relay 11 would be released and a circuit for relay 8 would again be closed to cause a false operation of the lamp 13. It will also be apparent that by this arrangement either end of the trunk is adapted to be associated with ny station without change in equipment.

7 While there is shown and described herein one-preferred form of the invention by way j (of illustration, it is understood that it'is not limited or confined to the precise details herein described and delineated, as modification and variation may be made within the scope of the claims without departing from I thespi rit of the invention.

Having thus described my invention, what I claim anddesire to secureby Letters Patent is: i V

-1. In a telephone system, atrunk extending between two stations, a controlling relay and a signal responsive relay associated with the trunk at each station means responsive to the connection of telephone apparatus to the trunk at either station to actuate the signal responsive relay at the other station, means responsive to the connection of telephone apparatus to the trunk at said other station to operate the controlling relay thereatto open the circuit of the signal responsive relay, and'means to maintain the controlling relay operated' until the telephone apparatus is disconnected from both ends of the trunk.

'2. In a telephone systenna trunk extending between two stations, a. controlling relay and a signalresponsive relay. associated with the trunk at ea'ch station, means responsive to the connections of telephone apparatus to the trunkat either station to operate the controlling relay thereat, means responsive to the operation of said controlling relay to operate the signal responsive relay at the other station, means responsive to the connection of telephone apparatus to the'trunk at said 'other'station to operate the controlling relay thereat to open the circuit of the signal responsive relay, and means to maintain said controlling relays operated until the telephone apparatus is disconnected from both ends of the trunk.

3. In a'telephone system, a trunk extending between two stations and con'iprising talking conductors and a signaling conductor, a controlling relay and a signal responsive relay associated with the trunk at each station, means responsive to the connection of telephone apparatus to the trunk at one station to operate the signal responsive relay at the other station over said signaling conductor, means responsive to the connection of telephone apparatus to the trunk ut said other station to operate the controlling relay thereat to open the circuit of said signal responsive relay, and means to maintain said controlling relay operated until the telephone apparatus is disconnected from both ends of the trunk.

4. In a telephone system, a trunk extending between two stations and comprising talking conductors and a signaling conductor, a controlling relay and a signal responsive relay associated with the trunk at each station, means responsive to the connection of telephone apparatus to the trunk at one station to operate the controlling relay thereat, means responsive to the operation of said controlling relay to operate the signal responsive relay at the other station over said signaling conductor, means responsive to the connection of telephone apparatus to the trunk at said other station to operate the controlling relay thereat to open the circuit of said signal responsive relay and means to maintain said controlling relays operated until the telephone apparatus is disconnected from both ends of the trunk.

5. In a telephone system, a trunk extending between two stations and comprising talking conductors and a signaling conductor, a controlling relay and a signal responsive relay associated with the trunk at each station, means responsive to the connection of telephone apparatus to the trunk at one station, to operate the signal responsive rclay at the other station over said signaling conductor, means responsive to the connections of telephone apparatus to the trunk at said other station to operate the controlling relay thereat to open the circuit of said signal responsive relay, and means to lock up said controlling relay over said signalingconductor.

(3. In a telephone system, a trunk extending between two stations and comprising talking conductors and a signaling conductor, a controlling relay and a signal responsive relay associated with the trunk at each station, means responsive to the connection of telephone apparatus to the trunk at one station to operate the controlling relay thereat, and means responsive to the operation of the controlling relay to operate the signal responsive relay at the other station and to look up the controlling relay over the signaling conductor, means responsive to the connection of telephone apparatus to the trunk at said other stationilnto operate the controlling relay thereat to open the circuit of said signal responsive relay, and means to look up said controlling relay over said signaling conductor. 10 In testimony whereof, I have si ned my name to this specification this thir day of December, 1918.

WILLIAM A. RHODES. 

